Window sash detent



Jan. 9, 1934 LE ROY LARSON WINDOW SASH DETENT Filed Feb. 23, 1933 2 Sheets-Sheet l 3noentor Jan. 9, L ROY ON WINDOW SASH DETENT Filed Feb. 23, 1953 v 2 Sheets-Sheet 2 Fig. 8.

N to M 4 N Ihwcntor Le Roy Larson M 7% W dttorneg Patented Jan. 9, 1934 UNITED STATES PATENT OFFICE WINDOW SASH DETENT Le Roy Larson, Hordville, Nebr. Application February 23, 1933. Serial No. 658,057

' 1 Claim. 7 (Cl. 292-242) This invention relates to window sash detents and has for an object to provide a window sash fastener adapted to be secured to the sash and carried thereby, whereby an eccentric clamping action may be provided against the adjacent window frame for locking the sash in selected positions with respect to the frame.

Another object of the invention is to provide a device which may be applied to either side of the sash and upon the styles thereof by inverting the device in instances where it is desired to lock the sash in a partly opened position in a manner to prevent the entrance of unauthorized persons into a dwelling and at the same time permit adequate ventilation.

A principal object of the invention is to provide a, device, the operating lever of which is countersunk below the surface of the device whereby said lever will not obstruct the free sliding movement of an upper sash past its lower mate. i

A further object of the invention is to provide a device which is comparatively thinand may be embedded into sash styles which are proportionately slender without unduly weakening such styles. N

A still further object of the invention to provide a device that may be made at a minimum of cost from sheet metal, the cam of which is so arranged that its open side wall is adapted to receive a counterslmk portion of the framerof the device whereby its operating lever maybe carried in said countersunk portionwhile at the same time permitting free swinging movements of the lever and cam about the countersunk portion for the overall purpose of providing a comparatively thin sash detent.

Another object of the invention is to provide a detent, the cam of which is provided with a partially smooth and partially rugose perimeter whereby during sliding movements of a window sash the side jambs of the window frame will not befiame unduly worn while at the same time providing adequate engagement between the jambs and cam for detaining the sash in a stationary position with respect to the window frame.

Other and further objects and advantages will be obvious 'from thefollowing detailed descrip- 'tion of the device, reference being had tothe accompanying drawings in which:

V Figure 1 is a side View of a fragment of the style of a window sash with the new detent applied thereto, the cam thereof being in an outward or normal position.

Figure 2 is a view similar to Figure 1, the cam the cam, and

Figure 5 is an edge view of the cam.

Figure 6 shows the partially serrated periphery of the cam.

Figure "I is an edge view of a fragment of a sash style with the new detent applied thereto.

Figure 8 shows a fragment of a window frame with an upper and lower sash mounted therein, the latter being partially broken away and the new device applied thereto, the view being taken substantially on the line 3-8 of Figure 9.

Figures is a transverse section of the window frame and sash taken on the line 9-9 of Figure 8.

Figure 10 shows that side of the new device opposite to the showing thereof in Figure 1 the cam and device being in an inverted position.

Figure 11 illustrates a fragment of a side jamb of a window frame with the new device applied thereto in a manner whereby it is prevented from a downward movement with respect to the jamb,

the new device being partially broken away.

Figure 12 isa side view of an integral shaft and lever employed.

Referring now to the drawings for a more particular description, 20 indicates generally a window frame provided with side jambs 21 and stops 22. It will be understood that the window frame also includes a head rail, a sill and the conventional parts which are not shown.

Vertically and slidably positioned within the window frame and detained therein by means of the said stops an upper sash 23 and lower sash 24 are positioned as shown in Figure 8.

The lower sash includes side styles 25, and the upper sash includes a side style 26 upon each of which a specimen of the new device is embedded as shown in Figure 8.

It will be understood that in instances where the lower sash is provided with a check rail that a parting stop is mounted on the jambs of the window frame whereby the upper and lower sashes are slightly spaced away from each other and that, as shown in Figure 9, where no parting stop is employed that a check rail and parting strip may be omitted, the faces of the styles check or head rail of the lower sash in instances where an object projects outwardly from the face of the style of the upper sash and above the check rail or head rail of the lower sash as heretofore practiced in the art.

The new detent includes a frame 27 having an outer exposed wall 28, an exposed side wall 29 and a wall 30 which is embedded into a sash style.

The outer Wall 28 is provided with screw receiving apertures 31 and as shown in Figure 10 is of greater area than the inner wall 30, whereby the screws 32 may pass by the inner wall 30 when the device is being secured to and embedded with in the plane of a sash style. 7 g

The sash styles are provided with a recess for receiving the new device and it will be noted that the latter is installed flush with the surfaces of the face and edge of the sash styles.

The frame 27 is substantially U-shaped in cross section and its exposed wall 28 is provided with a countersunk portion 33 of semi-circular shape, the depth of the countersunk portion 33 is equivalent to the thickness of an operating lever 34. A shaft 35 of the lever 34 is journalled in the exposed wall 28 and the oppositely disposed embedded Wall 30 of the frame. The lever 34 and shaft 35 are integral and disposed at a right angle with respect to each other. The lever 34 is provided with a cut-away or flattened surface 36 for contact with the fingers of an operator.

The cam 37 is rigidly mounted on the shaft 35 by any suitable means, the preferred manner being to provide the shaft with a flattened surface 38, as shown in Figure 12, whereby the shaft is substantially semi-circular in cross section, and correspondingly shaped apertures 38' through the wall 39 of the cam and an extension 40 thereof, whereby the cam is operatively secured to said shaft by inserting the latter through said walls.

As best shown in Figures 4 and 5, the wall 39 of the cam is provided with a flange 41 positioned at a right angle with respect to'said wall, the outer periphery of the fiange'bein'g so shaped that it is eccentric with respect to the axis of the cam and said periphery is provided with a rugose surface '42 upon its portion which is furthest distant from its axis, and a smooth surface 43, as shown in Figure 4. The cam is so arranged that its wall 39 and the extension 40 thereof are parallel, a spring receiving space being provided between the wall 39 and the extension 40 as shown in Figure 5.

Preferably a coiled spring 44 is employed which encircles the shaft 35, one endof thespring 44 being bent over the portion A of the cam which connects its side wall 39 and the extension 40 thereof, the said end being permanentlyfixed thereto. The other end of the spring is provided with a hook'45 which, as best shown in Figure 3, is adapted to be received in an aperture 46 formed through the countersunk portion 33 of the frame wall 28 whereby pressure of the spring is adapted to return the cam to a normal position at all times;

It will be noted that the cam is provided with an open side, as best shown in Figure 4, and that, as shown in Figure 3, the countersunk portion 33 of the wall 28 is received within the plane of the flange 41 of the cam and within the open side thereof, thus providing a comparatively thin construction, the cam being'permitted to have swinging movements about said countersunk portion 33, thus providing a comparatively thin construction which is adapted to be installed in comparatively thin sash styles without weakening the latter.

carrying out my invention in practice except. as

-means of the springs causing the cams to engage against the jambs of the window frame. In order to employ the device for looking a window sash in a selected open position whereby an unauthorized person positioned exteriorly of a dwelling is prevented from moving the sash, two of the devices are employed which, as shown in Figure 8, are mounted on opposite sides of the lower sash and one of the devices is placed in an inverted position, as shown in Figure 10. It will be understood that the cam of one of the detents will prevent an upward movement of the lowersash and that the other inverted cam will 0 prevent a downward movement thereof, since when force is applied to the sash for sliding it in either direction the said cams will resist the same and the more force that is applied the tighter the cams will lock. I

In order to release the cams for moving the sash the operator may move the cams by means of using the levers 34 for said purpose thus removing the rug'ose surfaces 42 of the cams-away unauthorized persons from entering through said sash opening of the window frame in that a downward movement of the upper sashis prevented. I

In instances where it is desired to lower the upper sash to the fullest extent whereby the new device, carried by the upper sash style, will thereby become inaccessible on account of being positioned behind the style of the lower sash,-l-25 the aperture 47 is employed and a pin, not shown, placed in said aperture for locking the lever 34 in a down position as shown in Figure 2, the

cam of the device at such time being in a re- 'tracted position, thus permitting the sash-to l 3O be freely moved. Y

From the foregoing description it is thought to be obvious that a window sash detent constructed in accordance with my invention is particularly well adapted for use by reason of 1-35 the convenience and facility with which it may be assembled and operated, and it will alsobe obvious that my invention is susceptible of some changeand modification without departing from,

"the principles and spirit thereof andfor thisl-40 reason I do not wish it to be understood aslimjiting myself to the precise arrangement and formation of the several parts herein shown in claimed. 1 45 What is claimed is:

fA window sash detent comprising an inner flat plate and an outer plate having a central countersunk portion, a sector shaped cam having its outer periphery flanged at right angles 1'50 tersunk portion at the other end for urging the cam outwardly, a lever lying within the plane of the countersunk portion, and a shaft secured to said lever, said shaft having mounted thereon, the cam, the spring and the plates.

LE ROY LARSON. 

